Blue iguana

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For the 1988 comedy film, see The Blue Iguana.

Blue iguana

Conservation status
Endangered (IUCN 3.1)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Family:	Iguanidae
Genus:	Cyclura
Species:	C. lewisi
Binomial name
*Cyclura lewisi* Grant, 1940
Synonyms
Cyclura nubila lewisi Grant, 1940 Cyclura macleayi lewisi Grant, 1940 Cyclura nubila lewisi – Schwartz & Thomas, 1975 Cyclura lewisi – Burton, 2004

The blue iguana (Cyclura lewisi), also known as Grand Cayman iguana, Grand Cayman blue iguana or Cayman Island blue iguana is an endangered species of lizard of the genus Cyclura endemic to the island of Grand Cayman. Previously listed as a subspecies of the Cuban iguana, it was reclassified as a separate species in 2004 because of genetic differences discovered four years earlier.

The blue iguana is one of the longest-living species of lizard (possibly up to 69 years). The record is 67 years.

The blue iguana prefers dwelling in rocky, sunlit, open areas in dry forests or near the shore, as the females must dig holes in the sand to lay eggs in June and July. A possible second clutch is laid in September. The blue iguana's vegetarian diet includes plants, fruits, and flowers. Its coloration is tan to gray with a bluish cast that is more pronounced during the breeding season and more so in males. It is large and heavy-bodied with a dorsal crest of short spines running from the base of the neck to the end of the tail.

The fossil record indicates that the blue iguana was abundant before European colonization; but fewer than 15 animals remained in the wild by 2003, and this wild population was predicted to become extinct within the first decade of the 21st century. The species' decline is mainly being driven by predation by feral pets (cats and dogs) and indirectly by the destruction of their natural habitat as fruit farms are converted to pasture for cattle grazing.

Since 2004, hundreds of captive-bred animals have been released into a preserve on Grand Cayman run by a partnership headed by the Durrell Wildlife Conservation Trust, in an attempt to save the species. At least five non-profit organizations are working with the government of the Cayman Islands to ensure the survival of the blue iguana. According to the November 9, 2013 episode of Ocean Mysteries with Jeff Corwin, the conservancy program has released over 700 captive bred Grand Cayman blue iguanas since the 2004 nadir of only 12 remaining animals.